package com.hmall.item.service.impl;

import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmall.item.mapper.ItemMapper;
import com.hmall.item.pojo.Item;
import com.hmall.item.service.IItemService;

import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

@Service
public class ItemService extends ServiceImpl<ItemMapper, Item> implements IItemService {
    @Autowired
    private RabbitTemplate rabbitTemplate;
    //修改商品状态
    @Transactional
    @Override
    public void updateItemStatus(Long id, Integer status) {
        this.update().set("status",status ).eq("id",id).update();
        String routingKey=status==1 ?"item.up" :"item.down";
        rabbitTemplate.convertAndSend("item.topic",routingKey,id);
    }
    //用户异常操作报错
    @Transactional
    @Override
    public void deduckStock(Long itemId, Integer num) {
        try{update().setSql("stock = stock-"+num).eq("id",itemId).update();}
        catch(Exception e){
            throw new RuntimeException("库存不足!");
        }
    }
}
